SEGMENT REPORTING (Total Assets by Geographical Area) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 3,641,675	$ 3,431,428
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	2,783,892	2,575,746
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	853,112	851,949
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Total assets	$ 4,671	$ 3,733